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What oath did athletes take beside the statue of Zeus Horkios?

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Map of southeastern Europe highlighting Greece and marking the location of Olympia with a red star, indicating its status as a World Heritage Site. Olympia is shown in the western part of the Peloponnese peninsula, surrounded by neighboring countries and nearby seas including the Ionian, Aegean, and Mediterranean. — Olympia Olympia was declared a UNESCO World Heritage site in 1989.

Beside the statue of Zeus Horkios—whose name means "Zeus Who Presides over Oaths"—athletes took an oath promising not to indulge in foul play during the Olympic Games.1